App crash on Mirror execute

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Consistent crashing when attempting to use the mirror function.
Seems to be a few different triggering points;

  1. Highlight lines, choose mirror function and when choosing mirroring plane system crashes.
  2. Choose mirror function and when highlighting lines system crashes.
  3. Crashes just choosing mirror function.

I have generated and uploaded multiple reports of the crash.

It might be worth noting that the system does not crash with any other function, just mirroring.

In addition, I have noticed that the app runs extremely slow at times recently.